Thanks ! Very useful ! Coming from gnome-shell, I was also missing this behavior.(For those who wonder why people would make a fuss about it, it comes in really handy in the following situation for example: you follow technical advice given step-by-step on a website, which you read in the background; you execute the commands in a terminal, which you have in the foreground. With the normal behavior, the terminal disappears below the browser every time you scroll the tutorial. Now it's possible to keep the terminal above... Which makes the whole thing really easier!)